Verify that deduplicated volumes and aggregates contain sufficient free space

Contributors Download PDF of this page

Before upgrading ONTAP, you must verify that any deduplicated volumes and the aggregates that contain them have sufficient free space for the deduplication metadata. If there is insufficient free space, deduplication will be disabled when the ONTAP upgrade is completed.

Each deduplicated volume must contain at least 4% free space. Each aggregate that contains a deduplicated volume must contain at least 3% free space.

  1. Determine which volumes are deduplicated: volume efficiency show

  2. Determine the free space available on each volume that you identified: vol show -vserver Vserver_name -volume volume_name -fields volume, size, used, available, percent-used, junction-path

    Each deduplicated volume must not contain more than 96% used capacity. If necessary, you can increase the sizes of any volumes that exceed this capacity.

    In this example, the percent-used field displays the percentage of used space on the deduplicated volume.:

    vserver    volume size    junction-path available used   percent-used
    ----------- ------ ------- -------------
    cluster1-01 vol0   22.99GB -             14.11GB      7.73GB 35%
    cluster1-02 vol0   22.99GB -             12.97GB      8.87GB    40%
    2 entries were displayed.
  3. Identify the free space available on each aggregate that contains a deduplicated volume: aggr show -aggregate aggregate_name -fields aggregate, size, usedsize, availsize, percent-used

    Each aggregate must not contain more than 97% used capacity. If necessary, you can increase the sizes of any aggregates that exceed this capacity.

    In this example, the percent-used field displays the percentage of used space on the aggregate containing the deduplicated volume (aggr_2):

    aggr show -aggregate aggregate_name -fields aggregate,size,usedsize,availsize,percent-used
    aggregate         availsize percent-used size    usedsize
    ----------------- --------- ------------    ------- --------
    aggr0_cluster1_01    1.11GB    95%          24.30GB 23.19GB
    aggr0_cluster1_02 1022MB    96%          24.30GB    23.30GB
    2 entries were displayed.